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Abstract : This study included examination of 50 sheep infected with abomasal nematodes, aged (1-5 years old) and of mixed sexes, from the slaughter of Kirkuk city, for the period from September 2021 to April 2022. Affected Sheep showed clinical signs that included, weakness, emaciation, pale mucous membranes, bottle jaw, rough, easily detached, and lusterless wool. Blood samples were collected from the Sheep to determine the effect of these nematodes on some hematological, trace elements, and oxidative stress parameters. Four species of nematodes identified in abomasum that are made on the basic morphology and length of worms include the: Ostertagia circumcincta 42%, Marshallagia marshall 28%, Haemonchus contortus 20% and Trichostrongylus spp. 10%, The results showed a reduction in R.B.C., hemoglobin, hematocrit, and WBC (4.11±0.10), (11.3 ±0.28), and (33±0.82), (13.3 ±0.53) respectively. And increased leukocytosis; Lymphocyte, eosinophil, and monocyte (44.2± 1.90), (48.3± 2.89), (14.8 ± 0.82) and (7.3± 0.51) respectively in infected sheep comparing with the control group. The results also showed a significant decrease (P < 0.05) in the rates of Superoxide dismutase SOD, vitamin B12, ferritin, and zinc (1563± 15.2 g/dl), (212.1 ± 4.7 µg/dl), (27.4 ± 2.4 µg/dl), (46 ± 4.6 µg/dl) respectively with increase of Malondialdehyde MDA concentration (537.8 ± 4.2 g/dl).

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